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/*
This file is part of GNUnet.
Copyright (C) 2012-2013, 2017-2018 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Affero General Public License for more details.
*/
/**
* @file gnunet-gns.c
* @brief command line tool to access distributed GNS
* @author Christian Grothoff
*/
#include "platform.h"
#include <gnunet_util_lib.h>
#include <gnunet_dnsparser_lib.h>
#include <gnunet_gnsrecord_lib.h>
#include <gnunet_namestore_service.h>
#include <gnunet_gns_service.h>
/**
* Configuration we are using.
*/
static const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
* Handle to GNS service.
*/
static struct GNUNET_GNS_Handle *gns;
/**
* GNS name to lookup. (-u option)
*/
static char *lookup_name;
/**
* record type to look up (-t option)
*/
static char *lookup_type;
/**
* raw output
*/
static int raw;
/**
* Desired record type.
*/
static uint32_t rtype;
/**
* Handle to lookup request
*/
static struct GNUNET_GNS_LookupWithTldRequest *lr;
/**
* Global return value.
* 0 on success (default),
* 1 on internal failures, 2 on launch failure,
* 3 if the name is not a GNS-supported TLD,
*/
static int global_ret;
/**
* Task run on shutdown. Cleans up everything.
*
* @param cls unused
*/
static void
do_shutdown (void *cls)
{
(void) cls;
if (NULL != lr)
{
GNUNET_GNS_lookup_with_tld_cancel (lr);
lr = NULL;
}
if (NULL != gns)
{
GNUNET_GNS_disconnect (gns);
gns = NULL;
}
}
/**
* Function called with the result of a GNS lookup.
*
* @param cls the 'const char *' name that was resolved
* @param was_gns #GNUNET_NO if TLD did not indicate use of GNS
* @param rd_count number of records returned
* @param rd array of @a rd_count records with the results
*/
static void
process_lookup_result (void *cls,
int was_gns,
uint32_t rd_count,
const struct GNUNET_GNSRECORD_Data *rd)
{
const char *name = cls;
const char *typename;
char* string_val;
lr = NULL;
if (GNUNET_NO == was_gns)
{
global_ret = 3;
GNUNET_SCHEDULER_shutdown ();
return;
}
if (! raw)
{
if (0 == rd_count)
printf ("No results.\n");
else
printf ("%s:\n",
name);
}
for (uint32_t i=0; i<rd_count; i++)
{
if ( (rd[i].record_type != rtype) &&
(GNUNET_GNSRECORD_TYPE_ANY != rtype) )
continue;
typename = GNUNET_GNSRECORD_number_to_typename (rd[i].record_type);
string_val = GNUNET_GNSRECORD_value_to_string (rd[i].record_type,
rd[i].data,
rd[i].data_size);
if (NULL == string_val)
{
fprintf (stderr,
"Record %u of type %d malformed, skipping\n",
(unsigned int) i,
(int) rd[i].record_type);
continue;
}
if (raw)
printf ("%s\n",
string_val);
else
printf ("Got `%s' record: %s\n",
typename,
string_val);
GNUNET_free (string_val);
}
GNUNET_SCHEDULER_shutdown ();
}
/**
* Main function that will be run.
*
* @param cls closure
* @param args remaining command-line arguments
* @param cfgfile name of the configuration file used (for saving, can be NULL!)
* @param c configuration
*/
static void
run (void *cls,
char *const *args,
const char *cfgfile,
const struct GNUNET_CONFIGURATION_Handle *c)
{
(void) cls;
(void) args;
(void) cfgfile;
cfg = c;
gns = GNUNET_GNS_connect (cfg);
if (NULL == gns)
{
fprintf (stderr,
_("Failed to connect to GNS\n"));
global_ret = 2;
return;
}
GNUNET_SCHEDULER_add_shutdown (&do_shutdown,
NULL);
if (NULL != lookup_type)
rtype = GNUNET_GNSRECORD_typename_to_number (lookup_type);
else
rtype = GNUNET_DNSPARSER_TYPE_A;
if (UINT32_MAX == rtype)
{
fprintf (stderr,
_("Invalid typename specified, assuming `ANY'\n"));
rtype = GNUNET_GNSRECORD_TYPE_ANY;
}
lr = GNUNET_GNS_lookup_with_tld (gns,
lookup_name,
rtype,
GNUNET_GNS_LO_DEFAULT,
&process_lookup_result,
lookup_name);
if (NULL == lr)
{
global_ret = 2;
GNUNET_SCHEDULER_shutdown ();
return;
}
}
/**
* The main function for gnunet-gns.
*
* @param argc number of arguments from the command line
* @param argv command line arguments
* @return 0 ok, 1 on error
*/
int
main (int argc,
char *const *argv)
{
struct GNUNET_GETOPT_CommandLineOption options[] = {
GNUNET_GETOPT_option_mandatory
(GNUNET_GETOPT_option_string ('u',
"lookup",
"NAME",
gettext_noop ("Lookup a record for the given name"),
&lookup_name)),
GNUNET_GETOPT_option_string ('t',
"type",
"TYPE",
gettext_noop ("Specify the type of the record to lookup"),
&lookup_type),
GNUNET_GETOPT_option_flag ('r',
"raw",
gettext_noop ("No unneeded output"),
&raw),
GNUNET_GETOPT_OPTION_END
};
int ret;
if (GNUNET_OK !=
GNUNET_STRINGS_get_utf8_args (argc, argv,
&argc, &argv))
return 2;
GNUNET_log_setup ("gnunet-gns",
"WARNING",
NULL);
ret = GNUNET_PROGRAM_run (argc, argv,
"gnunet-gns",
_("GNUnet GNS resolver tool"),
options,
&run, NULL);
GNUNET_free ((void*) argv);
if (GNUNET_OK != ret)
return 1;
return global_ret;
}
/* end of gnunet-gns.c */
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